Generate PDF from HTML in C#

When browsing, you might want to save a webpage’s HTML as a PDF for offline use. An all‑in‑one converter can transform HTML to PDF efficiently. As a C# developer, you can convert HTML files, HTML strings, or live URLs into PDF documents. This article explains how to generate a PDF from HTML in C#.

The following topics are covered:

1. C# API to Generate PDF from HTML
2. Generate PDF Document from HTML
3. Convert HTML to PDF with Save Options
4. Generate PDF from HTML String
5. Generate PDF from Live URL

C# API to Generate PDF from HTML

To create a PDF from an HTML file, we use the Aspose.HTML for .NET API. This advanced HTML processing library lets you create, modify, and extract data from HTML documents, and convert them to formats like PDF, XPS, or images without external software.

The HTMLDocument class represents an HTML page, while the PdfSaveOptions class defines PDF‑specific save settings. The Converter class provides conversion methods, including ConvertHTML() for HTML to PDF.

Download the DLL or install via NuGet:

PM> Install-Package Aspose.Html

Generate PDF Document from HTML in C#

Follow these steps to generate a PDF from an HTML file:

1. Load the HTML file with the HTMLDocument class.
2. Create a PdfSaveOptions instance.
3. Call Converter.ConvertHTML(), passing the HTMLDocument, PdfSaveOptions, and the output PDF path.

The code sample below demonstrates how to generate a PDF document from an HTML file using C#.

Convert HTML to PDF with Save Options in C#

Add custom save settings when converting HTML to PDF:

1. Load the HTML file with HTMLDocument.
2. Create a PdfSaveOptions object.
3. Set options such as HorizontalResolution, VerticalResolution, etc.
4. Invoke Converter.ConvertHTML() to produce the PDF.

The following code shows how to generate a PDF from an HTML file with additional options in C#.

Generate PDF from HTML String in C#

Create a PDF directly from an HTML string:

1. Instantiate PdfSaveOptions.
2. (Optional) Define custom save options.
3. Call Converter.ConvertHTML(), providing the HTML string, PdfSaveOptions, and the output PDF path.

The code sample below illustrates how to generate a PDF from an HTML string using C#.

Generate PDF from Live URL in C#

Convert a live webpage to PDF:

1. Create a Url instance with the target webpage address.
2. Instantiate PdfSaveOptions.
3. (Optional) Set additional save options.
4. Use Converter.ConvertHTML(), passing the Url, PdfSaveOptions, and the output PDF path.

The code sample demonstrates how to generate a PDF from a live URL using C#.

Get Free License

You can get a free temporary license to try Aspose.HTML for .NET without evaluation limitations.

Conclusion

In this article, we covered how to:

• Load an HTML file programmatically
• Define PDF save options
• Convert an HTML string to PDF
• Save a webpage as a PDF document
• Convert an HTML file to PDF in C#

Explore more about the Aspose.HTML for .NET API in the documentation. For questions, visit our free support forum.

See Also

• Create, Read, and Edit HTML Files in C#
• Download Image from URL in C#
• Convert Markdown to HTML in C#